Quoted from DickHamill:Displays
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Another wrinkle on the 7-digit displays is the commas. I haven't figured out where those signals are coming from, but I haven't looked very hard either. If anyone has a tip, please send it to me.
Nice work! This is a really cool approach Put me on the list for a board when you're ready
As for the commas, they are on PIA5 port B:
; PB6 Comma 3+4 1J8-01
; PB7 Comma 1+2 1J8-02